Investigation On Mechanical Properties Of Zr-based Amorphous Composites Prepared By Penetrating Casting Method

Zr_41.25Ti_13.75Ni₁₀Cu_12.5Be_22.5?Vit 1?has been continuously explored by researchers due to its high glass-forming ability and excellent mechanical properties,and it has been widely applied to engineering materials and structural materials structural materials.As a kind of alloy glasses,Vit 1 amorphous alloy not only inherited their high strength,but also had their shortcomings of high toughness and low ductility.In recent years,it has been found that an effective method of solving the low ductility of amorphous alloys was through the use of external particles and fibers,or amorphous authigenicing reinforcing phase methods.In this thesis,W particles or carbon steel balls were introduced into the Vit 1 amorphous matrix by through penetrating method preparation of W/Vit 1 and carbon steel ball/Vit 1amorphous composites.The purpose was aimed to study the influence of different extra phase and different sizes of different reinforcing phases on the plastic deformation capacity of Vit 1amorphous composites.Among them,the W particles added in W/Vit 1 amorphous composites.The mesh number of W particles were 24-30 mesh,30-35 mesh and 35-42 mesh,the carbon steel ball added in carbon steel ball/Vit 1 amorphous composites.The diameters of the carbon steel balls were 0.6 mm,1 mm,1.5 mm and 2 mm.Firstly,ProCAST numerical simulation software was used to simulate the penetrating casting ability of two kinds of amorphous composites when adding different sizes reinforcement phase,and two kinds of composite material samples were actually prepared according to the analysis results.SEM,XRE and DSC were used to analyze the bonding interface between Vit1 amorphous matrix and W particles or carbon steel ball and Vit 1 amorphous matrix to ensure that the interface of amorphous composite material was well bonding at the interface and the amorphous matrix was not crystallized.Finally,through the analysis of the compressive or tensile stress-strain curves,the influence of two kinds of reinforcing phases on the mechanical properties of the relatively amorphous composites was obtained,and the action mechanism of the reinforcing phases was analyzed through the fracture morphology and the distribution of shear bands.The experimental results show that the combination of the two exogenous reinforcing phase particles with the Vit 1 amorphous matrix alloy was good bonding in interface and the amorphous matrix was not crystallized.The compressive strength and the compressive plasticity of W/Vit 1 amorphous composites were all improved.The maximum compressive strength was 2476 MPa and the maximum compre ssive plasticity was 6.3%.The corresponding W particle sizes were 30-35 mesh and 24-30 mesh.The compression plasticity and the tensile plasticity of the carbon steel ball/Vit 1 amorphous composites were greatly improved in comparison with the Vit 1 amorphous alloys,and increase with the decrease of the size of the steel balls.In addition,the addition of carbon steel ball has a certain negative e ffect on the strength of Vit 1 amorphous alloy.The fracture morphology and the distribution of shear bands indicate that the introduction of exogenous reinforcing phase can inhibit the expansion of the shear band in the amorphous matrix,and evoked the formation of new shear bands with multi-directional properties,thereby increasing the plastic deformation capacity of the material.